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Research Papers: Forced Convection

High Rotation Number Effect on Heat Transfer in a Triangular Channel With 45 deg, Inverted 45 deg, and 90 deg Ribs

[+] Author and Article Information
Yao-Hsien Liu

Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwanyhliu@mail.nctu.edu.tw

Michael Huh

Department of Mechanical Engineering, University of Texas at Tyler, Tyler, TX 75799mhuh@uttyler.edu

Je-Chin Han

Department of Mechanical Engineering, Turbine Heat Transfer Laboratory, Texas A&M University, College Station, TX 77843-3123jc-han@tamu.edu

Hee-Koo Moon

 Solar Turbines Inc., San Diego, CA 92186

J. Heat Transfer 132(7), 071702 (Apr 29, 2010) (10 pages) doi:10.1115/1.4000986 History: Received August 08, 2009; Revised November 01, 2009; Published April 29, 2010; Online April 29, 2010

Heat transfer and pressure drop have been experimentally investigated in an equilateral triangular channel (Dh=1.83cm), which can be used to simulate the internal cooling passage near the leading edge of a gas turbine blade. Three different rib configurations (45 deg, inverted 45 deg, and 90 deg) were tested at four different Reynolds numbers (10,000–40,000), each with five different rotational speeds (0–400 rpm). The rib pitch-to-height (P/e) ratio is 8 and the height-to-hydraulic diameter (e/Dh) ratio is 0.087 for every rib configuration. The rotation number and buoyancy parameter achieved in this study were 0–0.58 and 0–2.3, respectively. Both the rotation number and buoyancy parameter have been correlated with predict the rotational heat transfer in the ribbed equilateral triangular channel. For the stationary condition, staggered 45 deg angled ribs show the highest heat transfer enhancement. However, staggered 45 deg angled ribs and 90 deg ribs have the higher comparable heat transfer enhancement at rotating condition near the blade leading edge region.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Internal gas turbine blade cooling passage

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Figure 2

Rotating facility

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Figure 3

(a) Details of the triangular test section and (b) cross-sectional view of the test section

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Figure 4

Rib configurations of the current study

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Figure 5

Conceptual view of the rib and rotation induced secondary flow in a rotating ribbed channel

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Figure 6

Nusselt number ratio distribution in the stationary channel

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Figure 7

Nusselt number ratio distribution in the rotating channel

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Figure 8

Effect of rotation number on three different regions

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Figure 9

Effect of Buoyancy Parameter on Nusselt number ratios at x/Dh=4.11

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Figure 10

Average heat transfer results at stationary and rotating conditions

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Figure 11

Friction factor ratio of different rib configurations

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Figure 12

Thermal performance comparison of L1, T1, and total average

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Figure 13

Correlations for heat transfer enhancement

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